The cyclic hexamer of phenylene sulfide (CHPS) is studied as a precursor of poly(p-phenylene sulfide) (PPS). The CHPS is one of the soluble components obtained by the extraction of poly(p-phenylene sulfide) with tetrahydrofuran (THF). Differential thermal analysis (DTA) is used to verify the purified cyclic compound. Fourier transform-infrared spectroscopy (FT-IR) and Raman spectroscopy are also employed. The spectra of the CHPS are compared with those of PPS and interpreted based on the symmetry of the molecules. Specifically, the C–H outof-plane bending modes (840–800 cm ⫺1) are indicative of the crystal structure and are utilized to identify two crystalline forms, a and b, of the CHPS. The spectrum of the polymer obtained from the CHPS is also reported.
Посилання на статтю:
Infrared and Raman spectroscopy of cyclohexa(p-phenylene sulfide) and the polymer obtained therefrom / Dean A. Zimmerman , Jack L. Koenig, Hatsuo Ishida // Polymer. – 1999. – N 40. – P. 4723–4731.